2 * APEI Hardware Error Souce Table support
4 * HEST describes error sources in detail; communicates operational
5 * parameters (i.e. severity levels, masking bits, and threshold
6 * values) to Linux as necessary. It also allows the BIOS to report
7 * non-standard error sources to Linux (for example, chipset-specific
10 * For more information about HEST, please refer to ACPI Specification
11 * version 4.0, section 17.3.2.
13 * Copyright 2009 Intel Corp.
14 * Author: Huang Ying <ying.huang@intel.com>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License version
18 * 2 as published by the Free Software Foundation;
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/acpi.h>
34 #include <linux/kdebug.h>
35 #include <linux/highmem.h>
37 #include <linux/platform_device.h>
38 #include <acpi/apei.h>
41 #include "apei-internal.h"
43 #define HEST_PFX "HEST: "
46 EXPORT_SYMBOL_GPL(hest_disable);
48 /* HEST table parsing */
50 static struct acpi_table_hest *__read_mostly hest_tab;
52 static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
53 [ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
54 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
55 [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
56 [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
57 [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
58 [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
59 [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
62 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
64 u16 hest_type = hest_hdr->type;
67 if (hest_type >= ACPI_HEST_TYPE_RESERVED)
70 len = hest_esrc_len_tab[hest_type];
72 if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
73 struct acpi_hest_ia_corrected *cmc;
74 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
75 len = sizeof(*cmc) + cmc->num_hardware_banks *
76 sizeof(struct acpi_hest_ia_error_bank);
77 } else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
78 struct acpi_hest_ia_machine_check *mc;
79 mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
80 len = sizeof(*mc) + mc->num_hardware_banks *
81 sizeof(struct acpi_hest_ia_error_bank);
88 int apei_hest_parse(apei_hest_func_t func, void *data)
90 struct acpi_hest_header *hest_hdr;
93 if (hest_disable || !hest_tab)
96 hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
97 for (i = 0; i < hest_tab->error_source_count; i++) {
98 len = hest_esrc_len(hest_hdr);
100 pr_warning(FW_WARN HEST_PFX
101 "Unknown or unused hardware error source "
102 "type: %d for hardware error source: %d.\n",
103 hest_hdr->type, hest_hdr->source_id);
106 if ((void *)hest_hdr + len >
107 (void *)hest_tab + hest_tab->header.length) {
108 pr_warning(FW_BUG HEST_PFX
109 "Table contents overflow for hardware error source: %d.\n",
110 hest_hdr->source_id);
114 rc = func(hest_hdr, data);
118 hest_hdr = (void *)hest_hdr + len;
123 EXPORT_SYMBOL_GPL(apei_hest_parse);
126 * Check if firmware advertises firmware first mode. We need FF bit to be set
127 * along with a set of MC banks which work in FF mode.
129 static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
132 struct acpi_hest_ia_corrected *cmc;
133 struct acpi_hest_ia_error_bank *mc_bank;
135 if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
138 cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
143 * We expect HEST to provide a list of MC banks that report errors
144 * in firmware first mode. Otherwise, return non-zero value to
145 * indicate that we are done parsing HEST.
147 if (!(cmc->flags & ACPI_HEST_FIRMWARE_FIRST) || !cmc->num_hardware_banks)
150 pr_info(HEST_PFX "Enabling Firmware First mode for corrected errors.\n");
152 mc_bank = (struct acpi_hest_ia_error_bank *)(cmc + 1);
153 for (i = 0; i < cmc->num_hardware_banks; i++, mc_bank++)
154 mce_disable_bank(mc_bank->bank_number);
160 struct platform_device **ghes_devs;
164 static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
168 if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
173 static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
175 struct platform_device *ghes_dev;
176 struct ghes_arr *ghes_arr = data;
179 if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
182 if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
184 for (i = 0; i < ghes_arr->count; i++) {
185 struct acpi_hest_header *hdr;
186 ghes_dev = ghes_arr->ghes_devs[i];
187 hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
188 if (hdr->source_id == hest_hdr->source_id) {
189 pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
194 ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
198 rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
202 rc = platform_device_add(ghes_dev);
205 ghes_arr->ghes_devs[ghes_arr->count++] = ghes_dev;
209 platform_device_put(ghes_dev);
213 static int __init hest_ghes_dev_register(unsigned int ghes_count)
216 struct ghes_arr ghes_arr;
219 ghes_arr.ghes_devs = kmalloc(sizeof(void *) * ghes_count, GFP_KERNEL);
220 if (!ghes_arr.ghes_devs)
223 rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
227 kfree(ghes_arr.ghes_devs);
230 for (i = 0; i < ghes_arr.count; i++)
231 platform_device_unregister(ghes_arr.ghes_devs[i]);
235 static int __init setup_hest_disable(char *str)
241 __setup("hest_disable", setup_hest_disable);
243 void __init acpi_hest_init(void)
247 unsigned int ghes_count = 0;
250 pr_info(HEST_PFX "Table parsing disabled.\n");
254 status = acpi_get_table(ACPI_SIG_HEST, 0,
255 (struct acpi_table_header **)&hest_tab);
256 if (status == AE_NOT_FOUND)
258 else if (ACPI_FAILURE(status)) {
259 const char *msg = acpi_format_exception(status);
260 pr_err(HEST_PFX "Failed to get table, %s\n", msg);
265 if (!acpi_disable_cmcff)
266 apei_hest_parse(hest_parse_cmc, NULL);
269 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
272 rc = hest_ghes_dev_register(ghes_count);
277 pr_info(HEST_PFX "Table parsing has been initialized.\n");